Features: 1. Hold on the power, 2 seconds, it will start working 2. electrical pulse stimulating enlargement 3. 4 modes and power level is tunable. Pulse mode/numb mode/absorb mode/auto mode 4. The diameter of the ring can be finetuned. 5. Total 4 cock rings. 6. Use 2x AAA batteries.( Not included). HOW to use it: